Check out this mid-sized mountain bike pack from Ergon. Using the innovative 'Adaptive Carrier System' the load is compressed and kept close to the body and stable. The self adjusting system is available in two sizes, small and large and the 4 position back length adjustment ensures every rider can find the perfect fit. The pack can be expanded from 16 to 19 liters using the zippered expansion facility and features main compartment, bladder compartment, rain cover, helmet retainer, front and side pockets, and organization compartments. The volume and functional compartment mix make this an ideal pack for long days in the saddle, or even the daily commute. For added visibility the pack has HiLumen reflectors.